Google Mount St. Helens..there are amazing pictures showing what happened in the days, weeks, months, and years since the eruption..
If it is a normal fire, then yes, there will be seedlings coming up soon. As mentioned earlier, some seeds need fire to germinate. But a fire can get so hot that it actually kills everything within a foot of the surface. This sterilization is rare but may have happened in certain parts of the Rim Fire.